Geomaterials Laboratory Testing

Concrete petrography testing - thin slice

Concrete Petrography

Sandberg is UKAS accredited to carry out concrete petrography and SEM analysis in accordance with ASTM C856 and APG-SR2.

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Microscope thin section showing pyrrhotite oxidation and internal sulfate attack in a concrete block from Co Donegal

Concrete Block Testing for Pyrite, Pyrrhotite and Mica to I.S. 465:2018 + A1 2020

Testing of concrete blocks containing mica and pyrite-bearing aggregates in accordance with the methodology set out in Irish Standard, IS 465:2018 + A1 2020.

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Cracking in a wall caused by mundic concrete. A crack width measuring gauge is fitted to measure the crack width.

Mundic Concrete

Sandberg has extensive experience with construction in South-West England where so-called Mundic concrete has been used in building construction.

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Detail photograph of the working parts of the Hitachi SU 3500 scanning electron microscope (SEM)

Scanning Electron Microscopy (SEM) and X-Ray Microanalysis

Sandberg’s Hitachi SU3500 VP SEM is capable of magnifications over x100000. Characterisation of soil microstructure, cement hydrate morphology and many other applications are possible.

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A thin slice viewed under a microscope shows Sulphate attack of concrete

Sulfate Attack

Sulfate attack in concrete occurs when sulfate solutions react with the calcium aluminate hydrates present in the hardened cement to form the hydrated calcium sulfoaluminate.

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